Electric-arc lamp



(No Model.)

N. G. MEADE. ELECTRIC ARC LAMP.

No. 568,861. Patented Oct. 6, 1896.

WIT "V'E SSE S 1.1V V'ENTOR I all? f 74QA/ UNITED STATES PATENT OFFICE.

NORMAN G. MEADE, OF .IAMESTOVN, NEIV YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 568,861, dated October 6, 1896.

Application filed May 15, 1896.

To all whom it may concern.-

Be it known that l, NORMAN G. MEADE, a citizen of the United States, residing in the city of Jamestown, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Electric-Arc Lamps; and I. do hereby declare that the following is a full, clear, and exact de scription of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

The object of my invention is to make a simple and eflicient arc-lamp and one that is directly operated by the electric current act-- ing upon an electromagnet.

The improvement consists in an entirely new feeding mechanism, consisting of a threaded carbon-rod actuated by a screw-clutch which is caused to rotate by suitable means, an adjustment for regulating the candle-power, means to prevent the carbon-rod from dropping too rapidly when released by the clutch, also aspeoial arrangement of contacts whereby a vibratory motion is given to the armature of an electromagnet, all of which will be fully understood by this specification and the accompanying drawings, in which- Figure 1 is a plan view of the feeding mechanism. Fig. 2 is a side elevation of the contact-block. Fig. 3 is a sectional elevation of the feeding mechanism. Fig. 4 shows springbrake for carbon-rod. Fig. 5 shows screw clutch released. Fig. 6 shows a perspective view of contact-block.

In the drawings, 1 is a square non rotating carbon-rod having screw-threads at the corners, which is suitably mounted in a lampframe and is provided with a sleeve and collar 2 which surround it and is held in position by the arm 6, as shown in Fig 3, being hinged at the center 9 of the magnet 5, and passing beyond the magnet is bent at right angle and passes down the length of the same and is.

provided with armature 22, as shown.

5 is a pole-piece of magnet 5.

2 is a ratchet-wheel attached to the sleeve 2 and is rotated by the pawl 8, that is hinged to the vibrating armature 13. (See Fig. 1.)

3 3 is a split screw=clutch hinged at the bot berial No. 591,664. kNo model.)

tom of the sleeve 2 and is held in contact with the threaded rod by the coiled spring 10.

s3 is a portion of the frame of lamp to which the mechanism is applied.

23 23 is a collar resting securely on plate 23 and is beveled on its upper side. The bottom of the screw-clutch is beveled, so that when it is lowered to come in contact with the bevelcollar 23 the split clutch opens and releases the threaded rod 1, which may then be raised or lowered, as desired. Fig. 5 shows the clutch opened and the rod released. Fig. 3 shows the clutch closed.

24 is the case for the carbon-rod which extends above the lamp.

I secure the light springs 24 24 to the top of the carbon-rod l, as shown in Fig. 4, to cause friction, so that the rod will not drop too rapidly when released by the clutch.

4 is a shunt-magnet mounted horizontally in the frame of the lamp 4 4., being the polepieces of the magnet, in one of which the armature 13 is hinged. This armature is provided with a small arm 13 at one end, to the end of which I secure coiled spring 12, as shown in Fig. 1. .At the opposite end of this pole I secure small bracket 4.", which is provided with a hole to receive threaded rod 12, which is secured to one end of the coiled spring 12 and has a nut 12 to regulate the'tension of spring 12, which spring governs the armature and regulates the candle-power.

15 is a bracket secured to p0le-piece 4 and has a screw 15 to regulate the distance the armature travels.

7 is a block of non conducting material the top of which is shown in plan View, Fig. 1, and its position in the lamp is shown in Fig. 3, it being secured at the top of this metal piece 7. This metal piece extends downward from the block and is secured to the base 23, which base is a part of the frame of the lamp. The

lower part of this support is broken off in Fig. 3 in order to show the working of the screw= clutch.

Fig. 2 shows a side elevation of the inner side, or side toward the center of the lamp, of the block 7, which has movable sliding strip 19, working in groove 19, as shown in Fig. 6.

Strip 19 contains long slot 18, through which the end of pin 14: just passes. This metal strip has contact with metal spring 20 at 20'.

Fig. (3 shows block 7 tipped back in order to better show this contact. Strip 19, workin g in groove 19, is moved by armature 18 and pin 14 just far enough under the point of spring 20 to make a good contact. Spring 20 is secured to the surface of block 7, and its point of contact is slightly turned up to cause a long make and break, yet one which is accomplished instantly.

16 is a short metal spring secured to the surface of block 7- above and parallel to sliding strip 19, and has connecting current-wire 16 connected thereto at one end and at the other the small metal cross-piece or rod 21, which presses against sliding strip 1.).

The operation is as follows: hen the currentis turned on, the magnet 5, being in the main circuit, attracts armature 22 and raises arm 0, which lifts the screw-clutch together withthc carbon-rod 1, the arms of the clutch sliding upthe bevel-collar 23, and are drawn around the rod 1 by spring 10 into normal position, as shown in Fig. 3, which position is maintained until the carbons are burned away, when the shunt-magnet 4 becomes magnetized and draws armature 13 toward it, at the same time turning ratchet-wheel 2 and breaking the circuit, which causes the arma ture 13 to vibrate until the carbons are lowered to normal position. This operation is repeated as occasion demands till the carbons are consumed or the current turned off, in whiehlatter case the clutch drops apart down bevel collar 23 and stands ready to start again as soon as the current is turned on.

I sometimes use a round threaded rod in place of the square threaded rod 1, making a long slot in the same, which has a key to keep it in position. It is not necessary for the split screw-clutch to spread as far as shown in Fig. 5 in order to be released, and I generally do not have it drop as low as shown.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In electric-arc lamps, ascrcw-clntch composed of collar 2, ratchet-wheel 2, spring 10,

hinged jaws 3, 3, in combination with beveled collar 23, 23, and means for actuating the clutch,substantially as shown and described.

2. In electric-arc lamps, a collar 2, ratchetwheel 2, spring 10, hinged jaws 3, 3, having their inner faces threaded and engaging with threads 011 carbon-carrier 1, and the beveled collar 23, 23, substantially as described.

3. In electric-arc lamps, a contact, or circuitbreaker consisting of nonconducting piece 7, spring 20, sliding piece 19 with slot 18, and pin 1%, spring 16 and piece 21 hearing on sliding piece 19, combined to operate substantially as shown and described.

4. In electric-arc lamps, the combination of a main magnet 5, pole-pieces 5', and 9, bent lever 6, armature 22, collar 2' and ratchetwheel 2, spring 10, hinged jaws i 3, and bevelcollar 23, 523, of spring-clutch, substantially as shown and described.

5. In electric-arc lamps, the combination of a shunt-magnet 1, armature 13 and pin 11 moving in slot 18 of sliding piece 19 in circuit breaker or contact, substantially as shown and described.

0. In cleetric-arclamps, the combination of a shunt-magnet 1, armature 13, pin 1i, pawl 8, lever 6, main magnet 5, armature E22, eollar 2, and ratchet-wheel 2, spring 10, hinged jaws 3, 3, beveled collar 23, 23, block 7, springs 16 and 20, with movable piece 10, slot 18, and piece 21 of contact or circuit breaker, substantially as shown and described.

In witness that I claim the foregoing I hereby sign my name in the presence of two witnesses.

NORMAN G. MEADE.

In presence of-- R. G. Ownus, N. E. THOMAS. 

